Headboard



FIG. 1 is a front elevation view of my new design;

FIG. 2 is a left side view thereof, the right side view being a mirror image thereof; and,

FIG. 3 is a front perspective view thereof.

The views of the headboard not shown form no part of the claimed design. The dash-dash lines in the figures represent features and environmental elements that form no part of the claimed design. The dash-dot line in each figure represents the unclaimed boundary of the claimed design. 

CLAIM I claim the ornamental design for a headboard, as shown and described. 